Adam , did you figure this out yet? If your pump is fine and is putting out sufficient pressure and volume then the only other thing I can think of is the gear box or an obstruction.

85' 4x4 e-cab flatbed 22r carb ((SOLD))
86' 4runner, 22re , "60 buck truck"
95' 4runner, 22re,5sd, last of the good ones
02' Tacoma prerunner, 2.7L, 5spd., 4x4